204421420434240 has 84 divisors (see below), whose sum is σ = 703124510711844. Its totient is φ = 54512378781696.

The previous prime is 204421420434233. The next prime is 204421420434263. The reversal of 204421420434240 is 42434024124402.

204421420434240 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 21 + 4 + 204 + 3 + 424 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145923887370816 + 58497533063424 = 12079896^2 + 7648368^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 204421420434195 and 204421420434204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35489827057 + ... + 35489832816.

Almost surely, 2^{204421420434240} is an apocalyptic number.

204421420434240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204421420434240 is an abundant number, since it is smaller than the sum of its proper divisors (498703090277604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204421420434240 is a wasteful number, since it uses less digits than its factorization.

204421420434240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70979659896 (or 70979659883 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 36.

Adding to 204421420434240 its reverse (42434024124402), we get a palindrome (246855444558642).

The spelling of 204421420434240 in words is "two hundred four trillion, four hundred twenty-one billion, four hundred twenty million, four hundred thirty-four thousand, two hundred forty".